cable hi line

No not completely when I had a HiLine a similar thing happened and it very gently clicked back but if it has come completely free I would seek proper advice.

If you can, have a good look to check if any articulation has not just loosened a ring, but also affected the connection of one of the wires inside.  Hopefully none of the lugs are damaged and the loose ring should click back in position.  Handle with kid gloves though as these things are as delicate as a very delicate thing!  As Bob advised, any doubts, you'd be well advised to take it back to your dealer to inspect.

Peter